View Compilation Error

0_0_38592515_4415.cpp: In function 'int main()':
0_0_38592515_4415.cpp:110:12: error: 'clock' was not declared in this scope
         if(clock()/CLOCK_PER_SEC>0.9) exit(0);
            ^~~~~
0_0_38592515_4415.cpp:110:20: error: 'CLOCK_PER_SEC' was not declared in this scope
         if(clock()/CLOCK_PER_SEC>0.9) exit(0);
                    ^~~~~~~~~~~~~